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Date:      Fri, 29 Mar 2024 10:02:14 -0700
From:      Gordon Tetlow <gordon@tetlows.org>
To:        freebsd-security@freebsd.org
Subject:   Disclosed backdoor in xz releases - FreeBSD not affected
Message-ID:  <1C17C92B-AFC2-4B7A-9594-25864156A546@tetlows.org>

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FreeBSD is not affected by the recently announced backdoor included in =
the 5.6.0 and 5.6.1 xz releases.

All supported FreeBSD releases include versions of xz that predate the =
affected releases.

The main, stable/14, and stable/13 branches do include the affected =
version (5.6.0), but the backdoor components were excluded from the =
vendor import. Additionally, FreeBSD does not use the upstream's build =
tooling, which was a required part of the attack. Lastly, the attack =
specifically targeted x86_64 Linux systems using glibc.

The FreeBSD ports collection does not include xz/liblzma.

Reference:
https://www.openwall.com/lists/oss-security/2024/03/29/4

Best regards,
Gordon Tetlow
Hat: security-officer=

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